iRhythm Ownership | Who Owns iRhythm?

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iRhythm Ownership Summary

iRhythm is owned by 169.97% institutional investors, 0.87% insiders. Tudor investment corp et al is the largest institutional shareholder, holding 63.31% of IRTC shares. Sands Capital Global Growth Equity is the top mutual fund, with 8.25% of its assets in iRhythm shares.

IRTC Ownership Benchmark

Type	Name	% Inst	% Insiders	% Retail
Stock	iRhythm	169.97%	0.87%	-70.85%
Sector	Healthcare Stocks	42.54%	10.83%	46.63%
Industry	Medical Device Stocks	37.80%	10.13%	52.07%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

Holder	Shares	% Holding	Value
Tudor investment corp et al	20.00M	63.31%	$27.45M
Vanguard group	3.24M	10.26%	$557.26M
Blackrock funding, inc. /de	2.88M	9.10%	$494.55M
Artisan partners limited partnership	2.57M	8.13%	$441.59M
Blackrock	2.50M	8.03%	$269.35M
Sands capital management	2.24M	7.08%	$384.59M
Capital research global investors	1.18M	3.75%	$203.59M
State street	847.88K	2.68%	$145.83M
Geode capital management	790.10K	2.50%	$135.91M
Blair william & co/il	740.72K	2.34%	$127.40M

Top Institutional Shareholders by % of Total Assets

Holder	Shares	% Assets	Value
Kampmann melissa s.	23.89K	3.00%	$4.11M
First light asset management	155.10K	2.51%	$26.68M
Next century growth investors	189.08K	2.37%	$32.52M
Rock springs capital management lp	235.00K	2.36%	$40.42M
Ophir asset management pty	101.56K	2.16%	$17.47M
Healthinvest partners ab	29.99K	2.03%	$547.61K
Eventide asset management	691.51K	1.96%	$118.92M
Stephens investment management group	519.96K	1.16%	$89.43M
Braidwell lp	225.84K	1.15%	$38.84M
Sands capital management	2.24M	1.06%	$384.59M

Top Buyers

Holder	Shares	% Assets	Change
Tudor investment corp et al	20.00M	0.05%	20.00M
Arrowstreet capital, limited partnership	541.04K	0.06%	532.74K
Millennium management	399.75K	0.02%	339.53K
Polar capital	335.91K	0.28%	334.56K
Price t rowe associates inc /md/	339.64K	0.01%	313.39K

Top Sellers

Holder	Shares	% Assets	Change
Sands capital management	2.24M	1.06%	-679.42K
Fiera capital	-	-	-381.64K
Slate path capital lp	-	-	-365.40K
Alyeska investment group	-	-	-351.75K
Capital research global investors	1.18M	0.04%	-323.13K

New Positions

Holder	Shares	% Assets	Change	Value
Tudor investment corp et al	20.00M	0.05%	20.00M	$27.45M
Jain global	131.09K	0.11%	131.09K	$22.55M
Perceptive advisors	123.00K	0.61%	123.00K	$21.15M
Norges bank	83.93K	0.00%	83.93K	$9.03M
Assenagon asset management	77.88K	0.02%	77.88K	$13.39M

Sold Out

Holder	Change
Coppell advisory solutions	-1.00
National bank of canada /fi/	-1.00
Innealta capital	-2.00
Financial gravity asset management	-2.00
Twin peaks wealth advisors	-2.00

Institutional Ownership Trends

Date	Holdings	Change %	Shares	Change %	Ownership	Change %	Increased Position	Change %	Decreased Position	Change %
Sep 30, 2025	333	5.38%	54,680,163	54.50%	169	1.35%	164	-2.38%	112	19.15%
Jun 30, 2025	316	18.35%	35,390,802	-1.62%	112	0.86%	169	26.12%	93	9.41%
Mar 31, 2025	8	-96.69%	1,629,968	-95.25%	5	0.04%	4	-96.43%	4	-95.35%
Dec 31, 2024	147	-44.11%	24,053,140	-29.85%	76	0.64%	71	-47.79%	51	-23.88%
Sep 30, 2024	262	9.17%	34,287,771	-3.47%	109	0.84%	136	1.49%	66	4.76%

Top Mutual Funds Shareholders

Holder	Shares	% Holding	Change
Sands Capital Global Growth Equity	2.65M	8.25%	-96.08K
Vanguard US Total Market Shares ETF	1.01M	3.21%	68.62K
Canada Life US Small-Mid Cap Growth A	1.00M	3.19%	-41.02K
Vanguard Total Stock Mkt Idx Inv	1.01M	3.13%	-26.84K
American Funds SMALLCAP World A	793.70K	2.49%	-700.00K
Vanguard Small Cap Index	774.60K	2.41%	-5.98K
iShares Russell 2000 ETF	770.00K	2.40%	-
Capital Group New Economy Comp	625.22K	1.96%	-
American Funds New Economy A	625.22K	1.96%	-
Artisan Mid Cap Investor	623.38K	1.95%	-28.10K

Recent Insider Transactions

Date	Name	Role	Activity	Value
Dec 02, 2025	Patterson Chad	CHIEF COMM & PRODUCT OFFICER	Sell	$51.75K
Dec 02, 2025	Murphy Patrick Michael	CBO and CLO	Sell	$458.01K
Nov 10, 2025	TALWALKAR ABHIJIT Y	-	Sell	$38.37K
Nov 10, 2025	TALWALKAR ABHIJIT Y	-	Sell	$254.86K
Nov 10, 2025	TALWALKAR ABHIJIT Y	-	Sell	$276.40K

Insider Transactions Trends

Date	Buy	Sell
2025 Q4	-	10
2025 Q3	-	17
2025 Q2	-	8
2025 Q1	-	16
2024 Q4	1	2

IRTC Ownership FAQ

Who Owns iRhythm?

iRhythm shareholders are primarily institutional investors at 169.97%, followed by 0.87% insiders and -70.84% retail investors. The average institutional ownership in iRhythm's industry, Medical Device Stocks, is 37.80%, which iRhythm exceeds.

Who owns the most shares of iRhythm?

iRhythm’s largest shareholders are Tudor investment corp et al (20M shares, 63.31%), Vanguard group (3.24M shares, 10.26%), and Blackrock funding, inc. /de (2.88M shares, 9.10%). Together, they hold 82.67% of iRhythm’s total shares outstanding.

Does Blackrock own iRhythm?

Yes, BlackRock owns 8.03% of iRhythm, totaling 2.5M shares as of Jun 2024. This represents 0.01% of BlackRock's total assets, with a market value of 269.35M$. In the last quarter, BlackRock increased its holdings by 61.23K shares, a 2.51% change.

Who is iRhythm’s biggest shareholder by percentage of total assets invested?

Kampmann melissa s is iRhythm’s biggest shareholder by percentage of total assets invested, with 3.00% of its assets in 23.88K iRhythm shares, valued at 4.11M$.

Who is the top mutual fund holder of iRhythm shares?

Sands Capital Global Growth Equity is the top mutual fund holder of iRhythm shares, with 8.25% of its total shares outstanding invested in 2.65M iRhythm shares.

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